ἀντιθετέον
From LSJ
ἢ λέγε τι σιγῆς κρεῖττον ἢ σιγὴν ἔχε → either say something better than silence or keep silence (Menander)
English (LSJ)
one must oppose, πρός τι ὅτι.. Arist.Pol.1286b2.
Spanish (DGE)
hay que oponer πρὸς τοῦτ' ἀ. ... ὅτι Arist.Pol.1286b2.
Greek (Liddell-Scott)
ἀντιθετέον: ῥημ. ἐπίθ. τοῦ ἀντιτίθημι, πρέπει τις νὰ ἀντιτάξῃ, τι πρός τι Ἀριστ. Πολιτικ. 3. 15, 10.